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Dissertations / Theses on the topic 'Propeller noise'

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Published: 4 June 2021

Last updated: 26 July 2025

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1

Prentice, Philip Ridley. "Asymptotic waveforms in propeller acoustics." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282923.

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2

Parry, Anthony Brian. "Theoretical prediction of counter-rotating propeller noise." Thesis, University of Leeds, 1988. http://etheses.whiterose.ac.uk/319/.

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A theoretical prediction scheme has been developed for the tone noise generated by a counter-rotation propeller. We start by deriving formulae for the harmonic components of the far acoustic field generated by the thickness and steady loading noise sources. Excellent agreement is shown between theory and measurements. Asymptotic approximation techniques are described which enable us to simplify considerably the complex radiation formulae, whilst retaining all of their important characteristics, and thus save, typically, 95% of computer processing time. Next we derive formulae for the radiated

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3

Li, K. M. "Noise of high speed propellers : A prediction method." Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384542.

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4

Matusiak, Jerzy. "Pressure and noise induced by a cavitating marine screw propeller." Espoo : Valtion teknillinen tutkimuskeskus, 1992. http://catalog.hathitrust.org/api/volumes/oclc/25913793.html.

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5

Duong, Hien Duc Carleton University Dissertation Engineering Aeronautical. "Measurements of unsteady propeller noise induced on a model fuselage." Ottawa, 1989.

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6

Johansson, Sven. "Active Control of Propeller-Induced Noise in Aircraft : Algorithms & Methods." Doctoral thesis, Karlskrona, Ronneby : Blekinge Institute of Technology, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00171.

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In the last decade acoustic noise has become more and more regarded as a problem. In cars, boats, trains and aircraft, low-frequency noise reduces comfort. Lightweight materials and more powerful engines are used in high-speed vehicles, resulting in a general increase in interior noise levels. Low-frequency noise is annoying and during periods of long exposure it causes fatigue and discomfort. The masking effect which low-frequency noise has on speech reduces speech intelligibility. Low-frequency noise is sought to be attenuated in a wide range of applications in order to improve comfort and s

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7

Thomas, Robert Dean. "The active control of the transmission of sound." Thesis, University of Southampton, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316440.

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8

Barros, Alexandre Bernardes de. "Análise de desempenho e ruído de hélices de mínima perda de energia." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/18/18148/tde-13012011-130409/.

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Revisa os métodos para cálculo de desempenho e ruído de hélices. Apresenta um método para determinação de desempenho de hélices com mínima perda de energia usando a teoria dos vórtices. Faz uso das tabelas de Goldstein que criam automaticamente a geometria da hélice através do acesso a um banco de dados aerodinâmico. Avalia o ruído harmônico com o método no domínio da freqüência, utilizando os valores de desempenho e geometria previamente calculados. Valida o método de desempenho e ruído através da comparação com dados experimentais. Apresenta um estudo de caso para desempenho e ruído de hélic

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9

Lim, Teck-Bin. "A unified computational fluid dynamics-aeroacoustics analysis of high speed propeller." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/12064.

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10

Moulton, Carey Lloyd. "The Near Field Acoustics of the Active Noise Control of a Model Propeller." NCSU, 2000. http://www.lib.ncsu.edu/theses/available/etd-20000726-233230.

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<p>The Near field properties of a 6" radius model propeller, and the Active Noise Control(ANC) of the Blade Passing Tone (BPT) have been studied. The study has been careful toidentify and separate the effects of the hydrodynamic near field and the geometric near field. The near and far field radiation regions of a model propeller were consideredseparately. Firstly to determine if far field control affects the near field noise levels and secondly to determine how the far field noise levels are affected by near field control. It has been found that active noise control (ANC) of the propeller bla

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11

Nigro, David. "Prediction of broadband aero and hydrodynamic noise : derivation of analytical models for low frequency." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/prediction-of-broadband-aero-and-hydrodynamic-noise-derivation-of-analytical-models-for-low-frequency(25bb8835-9cf8-488a-acc0-677a53122801).html.

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In this thesis we explore several topics with applications to both aero and hydroacoustics. Due to the much larger speed of sound in water compared to in air, several of the approximations used in aeroacoustics are not applicable underwater over the range of frequencies of interest. Specifically, we study the finite-chord effects on two broadband noise mechanisms: the trailing edge noise and the ingested noise problems. We start by investigating the acoustic wave diffraction by a finite rigid plate using three different methods. We compare the behaviour of the different solutions as a function

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12

Turkdogru, Nurkan. "Validity of the point source assumption of a rotor for farfield acoustic measurements with and without shielding." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37226.

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Measuring the farfield noise levels of full-scale rotor systems is not trivial and can be costly. Researchers prefer to perform small-scale experiments in the laboratory so that they can extrapolate the model scaled results to the larger scale. Typically Inverse Square Law (ISL) is used to extrapolate the sound pressure levels (SPL), obtained from model-scale experiments at relatively small distances to predict noise at much larger distances for larger scale systems. The assumption underlying this extrapolation is that the source itself can be treated as a point sound source. At what distance

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13

MIGLIANTI, LEONARDO PIETRO. "Modelling of the cavitating propeller noise by means of semi-empirical and data driven approaches." Doctoral thesis, Università degli studi di Genova, 2020. http://hdl.handle.net/11567/1004161.

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Historically, the mitigation of the ship radiated noise in the water was a prerogative of naval ships due to quiet requirements. In the last decades, the need for merchant ships and pleasure craft to ensure high standards of comfort on board in terms of on board radiated noise and structural vibrations lead also, indirectly, towards the reduction of underwater radiated noise. Nowadays, the greater awareness about the damages to the marine ecosystem as a result of the ship noise pollution is leading governments and international institutions towards the study of possible limits to acoustic em

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14

Wei, Jiangtao. "Modelling of fuselage/floor structures and associated cabin acoustics for the prediction of propeller induced interior sound fields." Thesis, University of Southampton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361553.

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15

Kiremitci, Utku. "Interior And Exterior Noise Analysis Of A Single Engine Propeller Aircraft Using Statistical Energy Analysis Method." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/2/12610558/index.pdf.

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Two different Statistical Energy Analysis (SEA) models of a single turbo-prop engine propeller aircraft have been developed to predict the interior and exterior noise levels. The commercial software VA One is used for the analysis. First model is a pure SEA model developed with ribbed plates on the aircraft exterior. Second model is a hybrid model which employs finite element (FE) modeling of aircraft components with low modal density. These models have been analyzed for three different flight conditions, namely, take-off, cruise and climb for three different damping loss factors in each condi

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16

Bullmore, Andrew John. "The active minimisation of harmonic enclosed sound fields, with particular application to propeller induced cabin noise." Thesis, University of Southampton, 1987. https://eprints.soton.ac.uk/52366/.

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This work considers the use of secondary acoustic sources for the reduction of noise levels in harmonically excited enclosed sound fields. This possibility is studied initially through the use of an analytical model of a single frequency `two-dimensional' rectangular, enclosed sound field of low modal density. Quadratic optimisation theory is used to predict the effectiveness of these active techniques for reducing sound levels. It is shown that if one chooses to minimise the total acoustic potential energy of the sound field then substantial global reductions in sound pressure may be achieved

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17

PETRIS, GIOVANNI. "Physics and modelling of generation and propagation of noise by complex sources in realistic basins." Doctoral thesis, Università degli Studi di Trieste, 2023. https://hdl.handle.net/11368/3042165.

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The need to develop more accurate numerical tools for the propagation of noise in underwater environments is driven by the continuous increase of human activity in the sea and coastal areas. Noise has been shown to be dangerous to marine wildlife, and steps should be taken soon to mitigate it. Knowing that the primary sources of noise pollution at sea are marine propellers, one of the problems is assessing how the noise generated interacts with the environment, since up to now, the main focus was the characterization of the acoustic signature in the near field or, alternatively, the propagatio

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18

Schenk, Austin R. "Computational Investigation of the Effects of Rotor-on-Rotor Interactions on Thrust and Noise." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/8611.

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Recent advancements in electric propulsion systems have made electric vertical takeoff and landing aircraft a reality, and one that is seen as a partial solution to the growing issue of urban traffic congestion. Designing an aircraft with multiple smaller motors and rotors spread across the wings–referred to as distributed electric propulsion (DEP)–has shown great potential in help- ing improve electric aircraft performance by offering increased propulsive efficiency, augmented lift, and structural load distribution. For these reasons, DEP is one configuration that is currently being implement

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19

Ecler, Matěj. "Optimalizace vrtulí pro bezpilotní prostředky s uvážením hlučnosti." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417465.

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This diploma thesis deals with optimization of propellers with the aim to reduce their noise level. Based on the measurement of noise level of serial propellers, major propeller noise sources were evaluated. Subsequent 2D simulations of the flow on the individual profiles along the propeller span revealed the locations of separation bubbles, which were identified as a potential source of the noise. Based on these findings, propellers were equipped with turbulator trips of various dimensions and their effect on the noise level and efficiency of the propellers was experimentally verified. The re

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20

Andersson, Magnus, and Peter Eriksson. "Analysis of noise levels, audio frequency and fuel consumption with propellers of type McCauley and MT on BAe Jetstream 32." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-14446.

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This report describes a thesis project conducted at Direktflyg in Borlänge, in early 2012, where the aim was to analyse the difference in noise level, audio frequency and fuel consumption between propellers of the older type McCauley and the newer type MT on the aircraft type BAe Jetstream 32. To perform the analysis, the authors reviewed current procedures regarding noise certification from air safety agencies to be able to identify suitable methods for the noise level and audio frequency measurements. The results of the conducted noise level measurements show a general lower noise level thro

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21

Acevedo, Giraldo Daniel. "Experimental and analytical investigation of the aerodynamic noise emitted by generic distributed electric propulsion wing-propellers configurations." Electronic Thesis or Diss., Ecully, Ecole centrale de Lyon, 2024. http://www.theses.fr/2024ECDL0015.

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Cette thèse étudie expérimentalement et analytiquement les effets d'installation acoustiques d'une paire d’hélices subsoniques de six pales installées côte à côte et près du bord de fuite d’une aile. Dans une gamme importante de basses et moyennes fréquences, le diamètre des hélices, la corde de l'aile et la distance aile-hélice sont plus petites que les longueurs d'onde acoustiques, atteignant un régime compact. Cette configuration générique imite les futures architectures d'avions urbains à propulsion électrique distribuée, adressée dans le cadre du projet H2020 de l’Union européenne ENODISE

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22

Dofek, Ivan. "Parametrická tvarová optimalizace letounu z aerodynamického hlediska." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-234201.

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The work deals with the use of geometric parameterization for shape description of some parts of the airplane. Geometric parametrization is used for creating a parametric model airfoil. This parametric model allows local deformations pobrchu profile and can easily be applied to generate the geometry of the wing or other parts letoumu. Some properties of the parametric model were tested applications in aerodynamic optimization. Furthermore, the work deals with the parametric description of the blades, the aerodynamic optimization and noise analysis. For propeller blade were created distribution

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23

Murray, Henry Hall IV. "Turbulence and Sound Generated by a Rotor Operating Near a Wall." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/71332.

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Acoustic and aerodynamic measurements have been carried out on a rotor operating in a planar turbulent boundary layer near a wall for a variety of thrust conditions and yaw angles with respect to the inflow. At the highest thrust condition a strong flow reversal in the wall-rotor tip gap was observed. Average velocity fields filtered by the angular position of the rotor show that the flow reversal is fed by jets of fluid that tend to form below the blade as it passes by the wall. Instantaneous velocity measurements show the presence of strong vortices in the tip gap. These vortices were ch

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24

Peake, Nigel. "The aeroacoustics of high-speed propellers and fans." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387124.

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25

Aktas, Batuhan. "A systematic experimental approach to cavitation noise prediction of marine propellers." Thesis, University of Newcastle upon Tyne, 2017. http://hdl.handle.net/10443/3639.

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Minimization of propeller cavitation noise is best achieved through accurate and reliable pre-dictions at an early design stage. The effect of cavitation and particularly the dynamics of cav-itation on URN is rather complex to understand and the current state of the art does not offer a plausible cavitation noise prediction method which can be implemented within the propeller design spiral. Within this framework, the aim of the present thesis is to enhance the understand-ing of the propeller cavitation noise by conducting detailed systematic cavitation tunnel tests to investigate the main prop

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26

Korkut, Emin. "An investigation into the scale effects on cavitation inception and noise in marine propellers." Thesis, University of Newcastle Upon Tyne, 1999. http://hdl.handle.net/10443/1135.

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This thesis presents an investigation into the phenomena of scale effects on cavitation inception and noise of marine propellers. The overall aim is to extend the understanding of these phenomena and improve predicting methods. The investigations, which are largely experimental in nature, are restricted to the tip vortex and sheet types of cavitation. Chapter 1 includes a state-of-the-art review of the scale effect studies based on published papers to form the basis for the main objectives and structure of thesis. The objectives require systematic tests in a cavitation tunnel to explore the vi

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27

Lidtke, Artur K. "Predicting radiated noise of marine propellers using acoustic analogies and hybrid Eulerian-Lagrangian cavitation models." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/413579/.

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Anthropogenic noise from a variety of merchant ships has been reported to be a major factor adversely aecting marine organisms. Consequently, scientists and regulators have become more vocal about encouraging, and possibly enforcing, quieter ships in the future. For this to be feasible from an engineering standpoint, a range of numerical methods must be made available to allow acoustic performance of vessels to be evaluated at the design stage. Cavitation is a major contributor to the hydroacoustic signature of a merchant vessel. The reason for this is the relatively high drop of pressure indu

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28

Cambuí, Dorilson Silva. "Dinâmica de Partículas Auto - Propelidas." Universidade Federal da Paraíba, 2011. http://tede.biblioteca.ufpb.br:8080/handle/tede/5701.

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Made available in DSpace on 2015-05-14T12:14:00Z (GMT). No. of bitstreams: 1 parte1.pdf: 2310445 bytes, checksum: 3cfca25ce861a7301fea8d5aa8526310 (MD5) Previous issue date: 2011-02-28<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>In this work, we study the collective behaviour of living systems whose aggregates form organized groups such as flocks of birds, herds of mamals and schools of fishes. Through numerical simulations, we model the collective movement of a school of fishes using behavioural rules similar to the ones proposed by Couzin et al. [23], th

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29

Moussa, Karim. "Computational Modeling of Propeller Noise: NASA SR-7A propeller." Thesis, 2014. http://hdl.handle.net/10012/8446.

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The aerospace industry has been concerned with propeller noise levels for years. This interest is two-fold: government regulation and comfort in cabin. This report attempts to create a simulation mechanism needed to evaluate the far-field noise generation levels. However, in order to do that, the tandem cylinder case was evaluated first as a validation step before the SR-7A propeller case was performed. Both cases use STAR-CCM+, a commercial software, to perform the simulations.

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30

Nakashima, Ann Marie. "Active control of propeller aircraft run-up noise." Thesis, 2003. http://hdl.handle.net/2429/18325.

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In 2000, the first phase of research on the feasibility of using active noise control (ANC) to control the noise from propeller aircraft run-up tests was completed by Germain. ANC is a noise cancellation technique that has been the focus of much research in recent years. It was of interest to extend the work by Germain, concentrating on the effects that phenomena such as atmospheric refraction and the ground impedance have on the performance of an ANC system. Furthermore, since propeller aircraft were found to have directional noise radiation, the studies must consider the effectiveness of an

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31

Neto, Pedro Matos. "Surrogate Modelling of Propeller Noise in Unsteady Load Conditions." Master's thesis, 2021. http://hdl.handle.net/10400.6/11694.

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The recent developments in electric technologies have been a catalyst to the electrification of air transport which typically requires the usage of propellers, known to produce high levels of noise. When coupled with tightening noise regulations and the possibility of operation near urban areas, an interest to study propeller noise arises. This dissertation presents the formulation and implementation of a numerical propeller noise analysis tool. The tool is capable of estimating the noise produced by a propeller under different inflow conditions and is designed to be used in propeller geometry

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32

Germain, Pierre. "Active control of run-up noise from propeller aircraft." Thesis, 2000. http://hdl.handle.net/2429/10612.

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Engine run-ups are part of the regular maintenance schedule at Vancouver Airport. The noise generated by the run-ups propagates into neighbouring communities, disturbing the residents. This research focuses on controlling run-up noise from propeller aircraft. It is well known that passive control measures - such as aircraft enclosures and acoustic barriers - can only attenuate sound at high and mid frequencies. Conversely, Active Noise Control (ANC) a new technology involving using noise to reduce noise, is an inexpensive alternative to enclosures. Propeller aircraft generate tonal noise

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33

Yang, Wen-Chih, and 楊文智. "Study on Propeller noise in Transient and Steady Field." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/fgu2f4.

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碩士<br>國立臺灣海洋大學<br>輪機工程學系<br>107<br>According to governing equation, the analysis of propeller noise can be divided into transient analysis and steady-state analysis, different results can be used to analyze physical characteristics of propeller, and finally, constructing the verification procedures of propeller noise. That is to say, through comparing the phenomena of transient analysis and steady-state analysis, the accurate of sound field radiation can be vertified. For transient analysis, Calculateing the differential pressure generated by propeller blade surface flow is based on unsteady R

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34

Syu, Jia-Hong, and 徐嘉宏. "Prediction of The Dipole Noise Due to The Unconventional Propeller." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/43jbuz.

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碩士<br>國立臺灣海洋大學<br>系統工程暨造船學系<br>105<br>The objective of this paper is to develop the procedure in predicting the dipole noise radiated by the unconventional propeller. The unconventional propeller such as Endplate Propeller (ENDP) is the best choice for submarines and warships to restrain any kind of cavitation without efficiency loss. When the propellers of submarines at diving depth, or warships at cruising speeds are operating in non-uniform wake field, cavitation is not allowable. For these cavitation-free propellers the noises generated by dipoles (i.e. unsteady forces) dominate. Besides,

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35

Hsu, Wen-Yen, and 許文彥. "Prediction of underwater noise from a marine propeller by acoustic analogy." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/ttf3qa.

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碩士<br>國立臺灣大學<br>工程科學及海洋工程學研究所<br>106<br>The objective of this thesis is to simulate the acoustic pressure field of a marine propeller. The flow field of a marine propeller is generated by software based on RANS. The method for calculating acoustic pressure used in this thesis is based on Ffowcs Williams-Hawking(FW-H) analogy. The partial differential and integral terms in FW-H acoustic wave equation are substituted with Finite difference method and Numerical integration. Besides, this thesis uses an inviscid flow field function generated by point source to verify the method reliability based o

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Chen, Chao-Hung, and 陳朝宏. "Computing the radiating noise of a marine propeller by porous formulation." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/paz997.

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碩士<br>國立臺灣大學<br>工程科學及海洋工程學研究所<br>107<br>The objective of this thesis is to simulate the acoustic pressure field of a marine propeller. The unsteady flow field of a marine propeller is generated by RANS. Two methods are used for calculating acoustic pressure in this thesis, fowcs Williams-Hawkings (FW-H) analogy and Porous Formulation. The differential terms and integrals in the formulations are approximated by Finite difference and numerical integration. At beginning, this thesis uses an inviscid function generated by a point source to verify the method based on FW-H. At last, this thesis uses

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Blunt, David Mark. "Optimisation and adaptive control of aircraft propeller synchrophase angles." Thesis, 2012. http://hdl.handle.net/2440/75757.

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This thesis provides a new and detailed examination of how the optimum propeller synchrophase angles for minimum cabin noise and vibration vary with different flight conditions, particularly altitude and airspeed, and how, based on these observations, adaptive control techniques could best be employed to further improve the noise-reducing potential of synchrophasing. This has been done through experimental investigations in one AP-3C Orion and two C-130J-30 Super Hercules aircraft. It is shown, using propeller signature theory, that synchrophasing has significant effects on the average cabin f

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McIntyre, Duncan. "Predicting cavitation-induced noise from marine propellers." Thesis, 2021. http://hdl.handle.net/1828/12552.

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Noise pollution threatens marine ecosystems, where animals rely heavily on sound for navigation and communication. The largest source of underwater noise from human activity is shipping, and propeller-induced cavitation is the dominant source of noise from ships. Mitigation strategies require accurate methods for predicting cavitation-induced noise, which remains challenging. The present thesis explores prediction and modelling strategies for cavitation-induced noise from marine propellers, and provides insight into models that can be used both during propeller design and to generate intellige

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姚鐘惠. "Prediction of the Far Field Noise Induced by Unsteady Propeller Sheet Cavitation." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/64086219965709663467.

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碩士<br>國立海洋大學<br>造船工程學系<br>87<br>The objective of this thesis is to develop a computer program to predict the perturbed acoustic pressure at far field, which is induced by unsteady sheet cavitation developed on marine propeller operating in a nonuniform wake field. The sources are used to simulate the blade thickness and cavity volume, and MIT-PUF-3A program is used to calculate the unsteady surface cavitation and the corresponding source strength. Under the assumption of compressible and inviscid flow, the linear wave equation is applied to the prediction of acoustic pressure. A com

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高瑞祥. "The prediction of far-field noise induced by unsteady force of non-cavitating propeller." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/26556657227841565102.

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碩士<br>國立海洋大學<br>系統工程暨造船學系<br>88<br>The main objective of this paper is to build a computer program which will be used to predict the far-field noise induced by unsteady force of non-cavitating propeller operating in the non-uniform wake field. The unsteady force under consideration includes two components; namely the axial thrust and the tangential torque force. Both of these two components are effectively the strength of equivalent dipole distribution and can be calculated by PUF-3A program, which was developed by MIT for analyzing propeller operating in non-uniform inflow. Under the assumpti

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41

Lin, Yan-Jhang, and 林彥璋. "Predicting and Measuring The Dipole Noise For The Propeller of a Oceanography Research Ship." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/dg9msb.

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碩士<br>國立臺灣海洋大學<br>系統工程暨造船學系<br>107<br>The objective of this paper is to predict the dipole noise caused by the underwater propeller for a surface vessel, and compare the calculated results with experimental data to verify the used method. Propeller cavitation is not allowed when the submarines dive at diving depth and the surface vessels operate at cruising speed. For these cavitation-free propellers operating in the non-uniform wake, the dominate noises are generated by the unsteady forces (i.e. dipole noise). The unsteady forces include three components: the axial thrust, the tangential torq

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42

夏盟均. "On The Prediction Method of Propeller Induced Cabin Noise of Sister Container Ship with Different Propulsion Power." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/56677852649636821724.

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碩士<br>國立海洋大學<br>系統工程暨造船學系<br>89<br>The main purpose of this research is to establish a method to predict the inboard noise of the sister ships using different propulsion power . However , the inboard noise is mainly the broadband noise induced by propeller tip vortex cavitation . The tip vortex index method developed by DNV is adoped and modified to predict the propeller tip vortex cavitation diameter , and the circulation at the propeller tip in the wake field is calculated by unsteady propeller lifting surface theory . Four sister ships of 2200TEU container builded by C.S.B.C. are calculated

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Lin, Jian-Hung, and 林建宏. "The noise distribution and simulation of its impact by the jet and propeller aircraft - a case study of Makung airport." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/375z6p.

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碩士<br>國立屏東科技大學<br>環境工程與科學系所<br>103<br>As a result of economic growth leisure activity and tourism obtain increasing attention in Taiwan. The tourism activity in Penghu becomes popular; thus, the air traffic between Taiwan and Penghu islands grows significantly over time. However, this causes aviation noise problems and affected the live quality of residents around the airport area. Because people tend to ask for a better environment, the environmental agencies have to decrease the impact of aviation noise pollution. In this study, the aviation noise control by substituting all the jet aircraft

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Anand, Apurva. "Aerodynamics of Nose Mounted Propeller Aircraft." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5213.

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The thesis deals with the aerodynamic analysis of a nose-mounted propeller aircraft using the flow solver HiFUN. Unsteady RANS simulations using sliding mesh technology is performed on aircraft with the propeller. The study on the aerodynamics of a propeller-driven aircraft is challenging because of the interaction of propeller slipstream with wing and other components, leading to the modi cation of force and moment coefficients of the aircraft, and performance parameters of the propeller as well. The steady code is validated on the aircraft geometry without a propeller, which is also referre

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Yen-TsenLin and 林彥岑. "Experimental Study on the Reduction of Underwater Ship Propeller Noises by Using Bubble Screen Techniques." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/z4w49h.

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博士<br>國立成功大學<br>水利及海洋工程學系<br>104<br>Experimental Study on the Reduction of Underwater Ship Propeller Noises by Using Bubble Screen Techniques Yen-Tsen Lin Ching-Jer Huang Department of Hydraulic and Ocean Engineering National Cheng Kung University SUMMARY The purpose of this experimental study is to design an optimal bubble screen for reducing the underwater propeller noises of surface vessels.The experiments were carried out in a towing tank. A propeller was installed in a ship model to simulate the noises produced by a surface vessel and hydrophones were used to monitor the radiated soun

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Kao, Jui-Hsiang, and 高瑞祥. "Theoretical Prediction of The Marine Propeller Radiated Blade Rate Noises – Including The Scattering Effect Due to Ship Hull." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/59078857508754789988.

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博士<br>國立臺灣海洋大學<br>系統工程暨造船學系<br>92<br>Abstract The main objective of this thesis is to develop a new and efficient numerical method for predicting the far-field and near-field blade-rate noises of marine propellers operating in a non-uniform ship wake by linear acoustic theory. In addition, both the scattering effect from the ship hull and the reflecting effect from the free surface are included. In the present method, an exact analytic solution satisfying the linear wave equation for predicting acoustic pressure caused by unsteady sheet cavitations, unsteady thrusts and torques can be derived

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